Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 724 | 662 | 735 | 707 | 731 | 711 |
| Tmin | 735 | 665 | 735 | 708 | 735 | 708 |
| Duration of sunshine | 148 | 134 | 148 | 138 | 146 | 142 |
| Precipitation | 744 | 672 | 747 | 720 | 744 | 720 |
| Humidity/Visibility | 143 | 131 | 145 | 134 | 142 | 140 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 734 | 768 | 752 | 759 | 712 | 740 |
| Tmin | 740 | 762 | 765 | 765 | 733 | 737 |
| Duration of sunshine | 144 | 174 | 186 | 182 | 156 | 151 |
| Precipitation | 744 | 779 | 779 | 794 | 737 | 746 |
| Humidity/Visibility | 148 | 173 | 187 | 179 | 154 | 148 |
Climate data is usually derived from meteorological data of a certain number of years. The actual number of recorded years may vary from only a couple to 50 years or more. The quality of climate data depends on the number of available recorded years. Fewer years means less reliable data. The standart-period for reliable climate data is 30 years. For example, the mean monthly temperature for, let's say January, would ideally calculated from a total number of 930 recorded January-days. However, the usual number of recorded days is much smaller. The table above shows the actual number of recorded days for every parameter measured. |
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